@Override
  public void execute(
      FsService fsService,
      HttpServletRequest request,
      ServletContext servletContext,
      JSONObject json)
      throws Exception {
    String target = request.getParameter("target");

    FsItemEx fsi = super.findItem(fsService, target);
    InputStream is = fsi.openInputStream();
    String content = IOUtils.toString(is, "utf-8");
    is.close();
    json.put("content", content);
  }
  @Override
  public void execute(
      FsService fsService,
      HttpServletRequest request,
      ServletContext servletContext,
      JSONObject json)
      throws Exception {
    String target = request.getParameter("target");
    String name = request.getParameter("name");

    FsItemEx fsi = super.findItem(fsService, target);
    FsItemEx dir = new FsItemEx(fsi, name);
    dir.createFolder();

    json.put("added", new Object[] {getFsItemInfo(request, dir)});
  }